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DS1337, DS1337C
I²C Serial Real-Time Clock

Industry's Smallest I²C RTC with Two Time-of-Day Alarms


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 240kB)
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The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.

The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.

Key Features   Applications/Uses
  • Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
  • Available in a Surface-Mount Package with an Integrated Crystal (DS1337C)
  • I²C Serial Interface
  • Two Time-of-Day Alarms
  • Oscillator Stop Flag
  • Programmable Square-Wave Output Defaults to 32kHz on Power-Up
  • Available in 8-Pin DIP, SO, or µSOP
  • -40°C to +85°C Operating Temperature Range

 
  • Consumer Electronics (Set-Top Box, VCR/Digital Recording)
  • Handhelds (GPS, POS Terminal, MP3 Player)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printer, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Router, Switcher, Server)

    Diagram
    DS1337, DS1337C: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-4652; 2009-07-17
    This page last modified: 2009-07-17


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